It takes us some time to adjust our eyesight on entering a dark room. This is because our eye consists of two kinds of photoreceptors namely, the rods and the cones. The rod cells are responsible for our ability to see in the dark. However, for the rods to completely adjust to darkness it takes nearly 30 minutes.

Although the idea of night vision involves a lot of biological processes, there are studies that say an effort can really help tweak and enhance the entire process. And this can be done without any kind of genetic manipulation. All we may need is glasses, for that matter.

The rod cells send higher vibes and contrasting images on seeing the red light, hence making it easy to make out the object. This is the reason behind keeping the red lights in places that are required to be kept dark (eg. Photography Labs) so as to make the objects visible to humans.

Lately,a technologythat relies on this principle is patented by IBM. This will now be used in the Google Glass.

A projector that beams with red light is incorporated in the eyeglass lens. So that when the wearer of Google Glass enters into a dark environment, the projectors by itself projects red light into each eye so as to make the objects visible. This process guiles the rods to send higher contrast images to the brain, giving the glasses night-vision characteristics.

If you want to dig in deeper into this discovery you may also get more information onnight vision and the chemicals behind it here.

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Author: Technology and Beyond